Mi Air Purifier 3 comes with an ultra clear OLED display with touch control and can also be controlled via app - quiet and energy efficient. It has three layers, consisting of a primary filter, EPA Filter and activated carbon filter, to clean various particles such as dust, pollen and fibres, human hair and more. Xiaomi claims that the Mi Air Purifier can circulate and clean the air in a 750-square feet room in about 20 minutes. The Mi Home app that controls the purifier gives real time data on air quality index (AQI). Once setup, you can interact with the purifier from anywhere you wish as long as it’s switched on. App support for an IoT-enabled air purifier with basic filters makes it quite an attractive option at this price.